Chevron (6)
I believe the answer is:
stripe
'chevron' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for stripe that I've seen before include "Band of colour, maybe of rank" , "Thin band of colour" , "Chevron indicating rank" , "Chevron on a uniform to denote military rank" , "Length of material, maybe showing rank" .)